Durable plastic holder for test tubes and droppers designed for reliable everyday lab use Key benefits and features Durable construction: Robust plastic material designed for long service life in laboratory environments. Broad compatibility: Holds common reagent tube diameters — 30 mm, 20 mm, 18 mm, and 15 mm — so one holder fits multiple tube types. Multifunctional design: Securely accommodates both test tubes and droppers at the same time, keeping tools organized and accessible. Stable handling: Keeps tubes upright and separated to reduce spills, breakage, and workspace clutter. Lightweight and portable: Easy to carry between benches or work areas for flexible workflow. How this solves common lab problems Saves setup time by keeping tubes and droppers together and ready for use. Reduces accidental tipping and sample loss through stable, upright support. Simplifies multi-size workflows by accepting several standard tube diameters without swapping racks. Practical applications Teaching laboratories: Organize student workstations with a single holder that accepts widely used tube sizes and droppers during demonstrations or exercises. Clinical/sample processing: Stabilize multiple sample tubes and droppers at the bench to streamline routine pipetting, labeling, and temporary storage. Field sampling and mobile setups: Lightweight construction makes it convenient to transport between locations for environmental sampling or on-site assays. Suitable for routine use in research, teaching, clinical, and mobile lab environments where a compact, compatible, and reliable tube-and-dropper holder is required.